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Energy response of radiophotoluminescent glass dosimeter for diagnostic kilovoltage x-ray beams
| Content Provider | Scilit |
|---|---|
| Author | Nakatake, Chihiro Araki, Fujio |
| Copyright Year | 2021 |
| Description | Journal: Physica Medica Purpose This study aimed to investigate the energy response of a radiophotoluminescent glass dosimeter (RGD) for diagnostic kilovoltage x-ray beams by Monte Carlo (MC) calculations and measurements. Methods The uniformity and reproducibility of GD-352M (with Sn filter) and GD-302M (no filter) were tested with 45 RGDs in free air. Subsequently, the RGD response was obtained as a function of an Al-HVL using the parameter, quality index (QI), which is defined as the ratio of the effective energy (keV) to the maximum energy (keV) of the photons. The x-ray fluence spectra with QI of 0.4, 0.5, and 0.6 were set for tube voltages of 50 ~ 137.6 kVp. The RGD response was calculated in free air using the MC method and verified by the air kerma, $K_{air}$, measured using an ionization chamber. Results The uniformity and reproducibility of the 45 RGDs were ± 2.3% and ± 2.7% for GD-352M and ± 0.7% and ± 1.6% for GD-302M at the one standard deviation level, respectively. The calculated RGD response was 0.965 to 1.062 at Al-HVL 2.73 mm or more for GD-352M and varied from 3.9 to 2.8 for GD-302M. Both RGD responses exhibited a good correlation with the Al-HVL for the given QI. $K_{air}$ measured by RGDs for each beam quality with a QI of 0.5 was in the range of −5%~0.8% for GD-352M and −1.8%~3% for GD-302M, relative to the chamber measurements. Conclusions The RGD response was indicated as a function of the Al-HVL for the given QI, and it presented a good correlation with the Al-HVL. |
| Related Links | http://www.physicamedica.com/article/S112017972100079X/pdf |
| Ending Page | 149 |
| Page Count | 6 |
| Starting Page | 144 |
| ISSN | 11201797 |
| DOI | 10.1016/j.ejmp.2021.01.076 |
| Journal | Physica Medica |
| Volume Number | 82 |
| Language | English |
| Publisher | Elsevier BV |
| Publisher Date | 2021-02-18 |
| Access Restriction | Open |
| Subject Keyword | Journal: Physica Medica Radiology, Nuclear Medicine and Imaging Radiophotoluminescent Glass Dosimeter Diagnostic Kilovoltage X-ray Beams Energy Response Quality Index Monte Carlo Simulations |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics |
